When you go in to the Store, then click on "Account", then "My account" it shows the names of devices linked to your account.

What's worrying is that even after I've reset it and sold it, the device is still there, but now appears with the name the new person has given it! This happened once before when I sold my RT to a guy in work, I noticed his name now appeared under my devices. And now that I have sold my Pro 2, it now also is still in my devices, but with the name "Cathy" - whom I can only assume is the new person using the device!!! (see below pic)

AFAIK, there are no implications of this, but it seems wholly wrong that the device is still in my account, and worse that information this new person has entered in to the device (the name) can now be seen by me.